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Detection of hydrogen fluoride absorption in diffuse molecular clouds with<i>Herschel</i>/HIFI: an ubiquitous tracer of molecular gas
We discuss the detection of absorption by interstellar hydrogen fluoride (HF) along the sight line to the submillimeter continuum sources W49N and W51. We have used Herschel's HIFI instrument in dual beam switch mode to observe the 1232.4762 GHz J = 1 - 0 HF transition in the upper sideband …